JPH0444995Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fine pressure adjustment damper, and particularly to a fine pressure adjustment damper suitable for a room with a closed structure that requires constant internal pressure to be maintained at a predetermined positive pressure. .

[Conventional technology]

Conventionally, in rooms with high cleanliness and airtightness such as clean rooms, the interior of the room is always maintained at a predetermined positive pressure in order to prevent dust from entering the room.
For this purpose, a fine pressure adjustment damper is provided which has pressure adjustment blades that can open only in one direction from inside the room to outside the room.

The fine pressure adjustment damper changes its opening depending on the balance of its own weight according to the fluctuating positive pressure in the room.
The amount of exhaust air from inside the room to outside the room is regulated.

However, many rooms with closed structures are equipped with smoke exhaust equipment for disaster prevention purposes. Therefore, if the smoke evacuation equipment is operated during a fire outbreak or test run, the amount of smoke emitted will be
This is extremely large compared to the amount supplied to create positive pressure in the room.

Therefore, when the smoke exhaust equipment is operated, the pressure regulating vane operates from outside the room toward the inside of the room, closing the opening in the wall of the room. This resulted in excessive negative pressure in the room, resulting in damage to the room structures (ceiling, walls, windows, etc.).

[Problem that the invention attempts to solve]

The present invention solves the drawbacks of the prior art and provides a fine pressure adjustment damper that can immediately take in air from outside the room and reduce the negative pressure inside the room to prevent excessive negative pressure inside the room. .

[Means for solving problems]

The fine pressure adjustment damper according to the present invention is supported by a frame at an opening in the wall of a room with a sealed structure that needs to maintain a predetermined positive pressure inside at all times. In a fine pressure adjustment damper equipped with a pressure adjustment blade that can be opened only in one direction, an auxiliary blade that can be opened in the opposite direction to the opening direction of the pressure adjustment blade only when the inside of the room becomes negative pressure. is provided within the plane of the pressure regulating blade.

[Effect]

According to the fine pressure adjustment damper according to the present invention, when the pressure inside the room is positive, the pressure adjustment blade opens from inside the room to outside the room.

When the inside of the room becomes negative pressure, the pressure regulating blade first operates from outside the room toward the inside of the room, contrary to the above, and closes the opening in the wall of the room. Next, the auxiliary vane, which was provided in the plane of the pressure regulating vane before the degree of negative pressure became excessive, opens in the opposite direction to the opening direction of the pressure regulating vane, that is, toward the interior of the room.

As a result, air from outside the room flows into the room, reducing the negative pressure inside the room.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view of an embodiment of the invention.

A fine pressure adjustment damper is supported by a frame 4 at an opening in a wall 11 of the room, and has pressure adjustment vanes 2 inside the frame 4.

The pressure regulating blade 2 can be opened only in the direction from the inside 12 of the room to the outside 13 of the room about the rotation axis 5 when the inside of the room 12 becomes positive pressure.

The counterweight 1 is provided to balance the weight of the pressure adjustment vane 2 to enable smooth opening and closing operations, and the weight portion 19 is movable along the lever portion 20 so that the balance force can be manually adjusted. .

Next, the auxiliary vane 7, which is the key point of the present invention, is located inside the chamber 12 of the opening 10 made in the plane of the pressure regulating vane 2.
It is provided on the side with a size that completely covers the opening 10, and is attached to the pressure adjusting blade 2 so as to open in the opposite direction to the opening direction of the pressure adjusting blade 2, with the hinge 9 as a fulcrum.

As shown in FIG. 2, the auxiliary blades 7 include a flat gasket 14 provided around the opening 10 and a plurality of intermittently provided on the edge of the opening 10 on the opposite side (lower side in FIG. 2) of the hinge 9. The magnetic force of the flat magnet 8 attracts the two surfaces of the pressure adjusting blades so that no gap is created.

Next, we will discuss the operation.

When the supply equipment for creating positive pressure in the room 12 is not operated, the pressure regulating vane 2 is closed at the solid line position A in Fig. 1 while adsorbing the auxiliary vane 7.
becomes. When the supply equipment starts operating, the inside of the room 12 becomes positive pressure, and this positive pressure is applied to the pressure regulating vane 2.
The opening is in the open state B at the position indicated by the two-dot chain line in FIG. This allows the room to be maintained at a predetermined positive pressure.

On the other hand, when a fire occurs or a test run occurs, it becomes necessary to operate the smoke evacuation equipment. At this time, the 12 smoke exhaust ports in the room are opened and the smoke exhaust equipment is operated, but since rooms such as clean rooms are highly airtight, and the operation of the air supply equipment is stopped, only the smoke exhaust equipment is operated. Therefore, the pressure inside the room 12 becomes negative.

At this point, the pressure regulating blade 2 is in the closed state A as it moves from the outside 13 to the inside 12 of the room. At this time, the pressure adjusting blade 2 is brought into close contact with the frame 4 by the square packing 3 attached to the frame 4. Almost at the same time when the auxiliary blade 7 is closed, the negative pressure in the chamber 12 applied to the auxiliary blade 7 becomes greater than the magnetic force of the flat magnet 8 that is attracted to the pressure adjustment blade 2, and the auxiliary blade 7 is moved away from the pressure adjustment blade 2. It separates and opens at position C shown by the two-dot chain line in FIG.

As a result, air from outside the room 13 flows into the room 12, and the negative pressure inside the room 12 can be reduced.

The adsorption force between the auxiliary vanes 7 and the pressure regulating vanes 2 can be adjusted by changing the number of flat magnets 8, the length of the flat magnets 8, or the interval between the flat magnets 8.

Next, a modification of the present invention will be described.

FIG. 3 shows a cross-sectional view of a modification of the present invention, in which the auxiliary blade 7 is attracted to a flat magnet 8 provided around the opening 10 of the pressure adjustment blade 2, and when the inside of the room becomes negative pressure. It comes off and is held by the fall prevention chain 15. This modification can exhibit effects with a simpler structure than the embodiment.

FIG. 4 shows a sectional view of another modification of the present invention,
The auxiliary blade 7 is connected to a hinge 9b provided at the lower part of the opening 10 of the pressure adjustment blade 2, and is connected to the hinge 9b to lock the auxiliary blade 7, and a spring 16 that presses the stopper 17 against the auxiliary blade 7. It is installed on 2. When the inside of the room becomes negative pressure, the spring 16 contracts, the stopper 17 comes off from the auxiliary blade 7, and the auxiliary blade 7 rotates around the upper hinge 9a and opens toward the inside of the room.

The pressing force of the spring 16 can be adjusted by a wing nut 18.

[Effect of idea]

According to the present invention, it is possible to maintain positive pressure inside the room at all times, and to easily reduce the negative pressure in the room caused by the smoke exhaust equipment operated in the event of a fire outbreak or during a test run in a highly airtight room.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the invention, Fig. 2 is a front view of an embodiment of the invention, Fig. 3 is a sectional view of a modification of the invention, and Fig. 4 is another modification of the invention. FIG. 1... Counterweight, 2... Pressure adjustment blade, 7... Vane, 8... Flat magnet, 9...
Hinge, 10...Opening, 12...Inside the room, 13...
Outside the room, 14...Flat-shaped patchkin.

Claims (1)

[Scope of utility model registration request] The pressure inside the frame is supported by a frame at the opening in the wall of a room with a sealed structure that requires constant positive pressure to be maintained at a predetermined positive pressure inside the room, and the pressure inside the frame can only be opened in one direction from inside the room to outside the room. In the fine pressure adjustment damper equipped with adjustment blades, an auxiliary blade is provided in the plane of the pressure adjustment blade, which can open in the opposite direction to the opening direction of the pressure adjustment blade only when the pressure in the room becomes negative. A fine pressure adjustment damper characterized by: